what would last longer?

[silpena]

ka24det or na ka both on a safe tune... lets say kat running around 10 psi or na running around hmm 13.5.1 compression. I've heard high compression puts alot of wear on the crank shaft is it true? is so enlightent me on how. Ideal i would like na becuase i just don't turbo my car and i love na motors but easy power is allways nice for the price.

[ShionS14]

when you add 10psi to a stock motor you are still raising compression. a think a turbo would last you longer than a high comp na motor, simply because to get decent power out of the na motor you are going to have to approach some extremes of the engine, where as the turbo will just add heat to the engine and the stock internals have been seen taking up to 22 psi with a good tune. and ofcourse a 10psi turbo will get you more power than a na ka24de

[silpena]

My biggest concern is emissions. I know the high compression would pass visual ifi retain all emisions but would fail the test because of high combustion temps.. can i just run some alcohol injection to lower the temps to reduce nox and pass emissions.i just love n/a and i would like the reliablity of na withour having to tune my car with turbo just run it safely. weather changes and stuff like fog scare me.

[gumby74]

Thats some really high compression you are talking about.Normally I am an atmo. guy myself, but i would suggest a KA T on maybe 7 to 8psi. On a well matched turbo, lag could be non existent, and considering the type of fuel needed to run 13.5 compression, would pay for itself in fuel cost alone in about a year.I seriously doubt this would not add any more heat than an aluminum radiator, e-fans and good thermostat could not keep in check.I could be wrong...

[ShionS14]

you can pass emissions fairly easy with a turbo, i just did

[WWJD]

If your worried about emissions, dont mess with you cars CR.. And Turbo way out of the queston.

simple bolt ons and cam set up with AFC to up your timen' and fuel trim should do you good. when you ask questions about you opptions, its best to ask Cali folks. Cause we konw how limited we really are .

Or do what you want to your car and get to know someone that will smog & pass your car no mater what.

Or other typs of NA. like V8 LS1, there are guys in my area with LS1 Cali leagal 240sx. Just make sure all emission crap is there. Or a Nissan V8 of your liken'

[silpena]

oh course i'm going to leave al m emissions my biggest concern is about passing reducing the nox levels to get it to pass. i could just retard the timing and run some alky right? hell its hella compression but maybe i'll someone in the smog class here at college and ask them what they say if if if i can away with it. We have a cali stat ref at our campus whos the teacher.

[eazye2000]

Think of it this way. A high compression motor is always running with, you guessed it, high compression. A turbo motor only runs 'high compression' when you are in boost. So it's a catch 22 I suppose you could say.You ever wonder why Toyota, or Honda motors last so long when you don't molest them? They are low compression econo-cars. No 'wear and tear' persay.Someone correct me?

[silpena]

hmm never thought of it that way, i guess thats why they last so long. How come all of those honda guys run high compression pistons and they last for a long time?? idk i just wanna see what a high comression ka can really do with a stock crank, stock rods and semi built head with alky or some kind of injectio so i don;t have to buy race gas, hell maybe once i finish school i'll get a loan and build a high compression stroked ka. You might think its retarded, but come on, arn't you just a tad bit curious?

[S3t0_S13]

Quit thinking your driving a honda....240's arent known for N/A numbers

there are numerous threads people getting flamed for this...without forced induction, the KA will not make you any numbers, unless you plan on spending well over 5 grandjump the jdm bandwagongrab an SR20or just turbo ur KA till that blows then grab an SR20

[silpena]

i do drive a honda also so enhh! idon't think it'll cost 5 grand to make power with the ka bigvinnie got alot of power out of ka pretty cheap. I think just a simple build with higher compression pistions and well devolped head can do the trick. Revs who needs revs when you all the power down low. I will not jump the sr20 bandwagon, never did and never will. The sr20 is part of the reason 240s are dying and becoming a fad. Keep it out of teh us and keep the ka.

[240ka24]

silpen, your right it definitely doesnt need to cost 5g's to get hp out of the ka. Revving to 8000rpm isnt needed to make power here although that would be great.

[silpena]

i'm real curious how a bd stroker kit would act with a oem rebuild. Stock head and everything just a stroker kit. Kinda retarded but nice to see the difference.

[WWJD]

dude you dont need to stroke a KA. all you need is a balance crak. the ka has a long enough stroke. SOHC pistons (on the cheap side) a good cam combo, ECU tune. exhaust. You'll have a fun ride.

Now on your smog. well you'd have to use a wideband to see where your at with A/F mix. then you might get passed the sniffer. I mean how high do you want you CP?

[silpena]

i wanna go the highest ican baby! till i just go any more, just full out n/a power. maybe 13.5.1ish?. I know all it needs a balanced crank but if i'm gonna get a balanced crank i might as well increase the displacement a little. If i'm ok with the rev at now i'll let a few down more. Smog with a a/f wide band control will help alot. I'm just asking becuase if i finish school this year i'm gonna get another 240 with a bad motor ifi can find one for a "good" price and go crazy with it and keep my low milage stock 240 as my daily driver.

[240ka24]

13.5 too much compression for pump(91-91octane)gas, but if your going to use race gas then you might as well max out your compression ratio.

[silpena]

You think i can get away with pump(91) and alky injection?